PROBLEM TO BE SOLVED: To provide a superconducting magnet device capable of forming a magnetic field with high homogeneity without a significant increase in size.SOLUTION: A superconducting magnet device includes: a superconducting main coil (10) forming a main magnetic field; a superconducting correction coil group (20) including a plurality of superconducting correction coils (20A-20C); a main power supply (40); and an opening/closing section (50) connected in parallel to the superconducting main coil (10) and the superconducting correction coil group (20). The opening/closing section (50) includes a plurality of correction short-circuit switches (52A-52C) connected in parallel to the superconducting correction coils (20A-20C), respectively.SELECTED DRAWING: Figure 2【課題】著しい大型化を伴うことなく、均一度の高い磁場を形成可能な超電導マグネット装置を提供すること。【解決手段】超電導マグネット装置であって、主磁場を形成する超電導メインコイル(10)と、複数の超電導補正コイル(20A~20C)を含む超電導補正コイル群(20)と、主電源(40)と、超電導メインコイル(10)及び超電導補正コイル群(20)に対して並列に接続された開閉部(50)と、を備え、開閉部(50)は、それぞれが各超電導補正コイル(20A~20C)に対して並列に接続された複数の補正短絡スイッチ(52A~52C)を有すること。【選択図】図2